Bibliotheca Mythologica: Gods, Heroes and Monsters pretends to bring A Total War Saga: TROY closer to the original Greek myths, specially to the works by Homer and Hesiod. While most of its features work in all three game modes (Historical, Truth Behind the Myth and Mythos) it has been developed with the Mythos mode in mind. Total War: PHARAOH has a more historical version of this collection: Bibliotheca Historica: Kings and Heroes.

The Bibliotheca Mythologica consists of a main mod and two standalone mods:

• Bibliotheca Mythologica (Full mod)
  
• Gods of Olympus (Standalone)
  
• Heroes of Troy (Standalone)

Bibliotheca Mythologica: Gods, Heroes and Monsters is the main mod, it adds new mythological creatures to the Mythos mode and it reworks the recruitment mechanic to make it more lore friendly with the Greek myths. It also contains the features of the Gods of Olympus and Heroes of Troy mods.

This Gods of Olympus mod adds the 12 Olympian gods to the game, as well as Dionysus and Hades. Each new god has fully fleshed out cult level and prayer bonuses, custom religious buildings, divine boons... The bonuses of each god and the flavour texts are based on the original Greek myths.

The Heroes of Troy adds 11 new playable heroes with their corresponding factions to the game, including 4 previously unplayable subcultures. In addition, the new playable factions have been added the Danaan Pillar or Trojan Pillar trait, so that they join one of the two great coalitions of the Trojan war, resulting in a massive war between the Danaan and Trojan armies.